<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<style>
    p {
        color: #f55;
        background: #fcc;
        width: 200px;
        line-height: 100px;
        text-align:center;
        margin: 100px;
    }
    .id {
        overflow: hidden;
    }
</style>
<body>
<!--? 同级元素边缘塌陷 解决方案，使两个元素属于两个BFC-->
<p>Haha</p>
<div class="id">
    <p>Hehe</p>
</div>
</body>
</html>
